These three letter combination -th, ch, and sh will show up often in early reader books and can make a beginner reader frustrated if they are unfamiliar. Do not let these words hold your child back. Similar to sight words, your child must memorize the letter combinations and be able to recognize them instantly. One way I like to reinforce these sounds is through song. Teaching through son is always an easy and fun way for children to learn something new. (Bonus: you can add funny hand gestures to accompany the song!)